DST-5-28

Overview

The Signal Transformer DST-5-28 is a Class 2 laminated power transformer designed for board mount applications. It features dual primary windings rated for 115 VAC and 230 VAC inputs. The secondary configuration provides a center-tapped output of 28 VCT at 420 mA or parallel outputs of 14 V at 840 mA, delivering a total power rating of 12 VA. Constructed with a split bobbin design, it ensures high isolation performance. The component utilizes through-hole mounting with PC pin termination and measures 48.4 mm in length, 40.4 mm in width, and 36.9 mm in height.

Feature Summary

• Utilizes a dual cavity split bobbin platform to enhance electrical isolation between windings.
• Features dual primary and dual secondary winding configurations for flexible input and output voltage options.
• Designed as a Class 2 transformer compliant with safety standards for low energy circuits.

Applications

• General purpose AC to DC power supply units
• Industrial control systems requiring isolated power stages
• Consumer electronics utilizing Class 2 power limitations

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current datasheet to ensure compatibility with required insulation classes and regulatory certifications. Confirm that the physical footprint matches the PCB layout constraints, specifically the 48.4 mm by 40.4 mm dimensions. Ensure the through-hole pin spacing aligns with existing assembly equipment capabilities before finalizing procurement orders.

Selection Notes

Select this model when a 12 VA power rating is sufficient for the load requirements. Choose the DST-5-28 over higher capacity variants like the DST-6-28 if space constraints are critical, given its smaller form factor. Consider the center-tapped secondary option if bipolar voltage rails are needed, or the parallel configuration for higher current single-rail applications.

Part Context

The DST-5-28 belongs to the Split/Tran series from Signal Transformer, which emphasizes compact size and high reliability. This series is characterized by its split bobbin construction, offering improved creepage and clearance distances compared to standard laminated transformers. It serves as a direct replacement for legacy components in equipment requiring robust isolation and standardized board-mount footprints.

Replacement Considerations

The DST-6-28 is a related model within the same series but offers a higher 20 VA rating. When substituting, verify that the increased power capacity does not necessitate changes to thermal management or PCB trace widths. Ensure the replacement part maintains the same 115/230 VAC primary voltage ratings and compatible secondary voltage outputs.